the green crab decimated fisheries and altered the local environment here. >> reporter: in the mississippi river, asian carp wipe out native fish. in the great lakes, zebra mussels are the problem. today, the challenge, contain invasive species before they get out of control. >> this problem is extremely serious and can cause environmental harm, economic harm, and harm even to human health. we're talking about over $100 billion worth of damage to the u.s. economy every year. >> reporter: for now, it's unclear what, if any damage, will occur in the pacific northwest. but tonight the experts don't like what they see. miguel almaguer, nbc news, san francisco. >>> when we come back, a big birthday for the first lady, though not the big one. and she celebrates with a new look. ♪ chances are, you're not made of money, so don't overpay for motorcycle insurance. geico, see how much you could save. >>> american airlines known by that instantly recognizable aa logo for so many years is tonight a little less recognizable because they have changed their look. in a big rollout campaign with accompany